APA
Nugawela A, . (1998). Yield decline in plantations - can excessive double tapping be a cause ?. : Bulletin of the Rubber Research Institute of Sri Lanka.
Chicago
Nugawela A, . 1998. Yield decline in plantations - can excessive double tapping be a cause ?. : Bulletin of the Rubber Research Institute of Sri Lanka.
Harvard
Nugawela A, . (1998). Yield decline in plantations - can excessive double tapping be a cause ?. : Bulletin of the Rubber Research Institute of Sri Lanka.
MLA
Nugawela A, . Yield decline in plantations - can excessive double tapping be a cause ?. : Bulletin of the Rubber Research Institute of Sri Lanka. 1998.